"Madonna wouldn't just break up with someone in the middle of a vacation," an insider tells E! News.

"I can't see her doing that. She really is never serious with any of these young guys, they are just flings that are really great until they aren't."

Our source adds, "Based on past relationships, I don't think she'd dump him mid-trip. If she was going to break up with Timor, I would think she would've done it before the trip like she did with Brahim [Zaibat]."

This echoes our previous report in June, when someone close to the Grammy-winning songstress told us that her romance with Steffens was "not serious" and "just a fling."